ISO INTERNATIONAL STANDARD 19703 Third edition 2018-06 Generation and analysis of toxic gases in fire Calculation of species yields, equivalence ratios and combustion efficiency in experimental fires Production et analyse des gaz toxiques dans le feu Calcul des taux de production des especes, des rapports d'équivalence et de I'efficacité decombustiondanslesfeuxexperimentaux Reference number IS0 19703:2018(E) [so @IS02018 license from IHS Not for Resale, 07/10/2018 07:04:52 MDT IS0 19703:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP401·Ch.deBlandonnet8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland @ IS0 2018 - All rights reserved Not for Resale, 07/10/2018 07:04:52 MDT IS0 19703:2018(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and units ..3 5 Appropriate input data required for calculations. ..4 5.1 Data handling. .4 5.1.1 Uncertainty ..4 5.1.2 Significant figures and rounding off .5 5.2 Test specimen information. 5.2.1 Composition .5 5.2.2 Net heat of combustion .5 5.3 Fire conditions 5 5.3.1 .5 Apparatus. 5.3.2 Set-up procedure .5 5.4 Data collection. .6 5.4.1 Data acquisition. .6 5.4.2 Measured data and observations .6 6 Calculation of yields of fire gases and smoke, stoichiometric oxygen-to-fuel mass ratio and recovery of key elements. .6 6.1 Calculation of measured yields from fire gas concentration data ..6 6.2 Calculation of notional gas yields. 6.2.1 General .9 6.2.2 Fromtheelementalcomposition 6.2.3 From the empirical formula .10 6.3 Calculation of recovery of elements in key products ..11 6.4 Calculation of stoichiometric oxygen-to-fuel mass ratio ..11 6.4.1 General. .11 6.4.2 From the chemical equation for complete combustion ..11 6.4.3 From the net heat of combustion, AH。 .13 6.4.4 From the carbon content of the material. .14 6.5 Calculation of smoke yields... ..19 6.5.1 General ..19 6.5.2 Smoke yields based on mass of smoke particulates .19 6.5.3 Smoke yields based on light obscuring properties .19 6.5.4 Relationship between mass measurement and light obscuration ..21 7 Calculation of equivalence ratio 21 7.1 General, .21 7.2 Derivation of Φ for flow-through, steady-state experimental systems. .23 7.3 Derivation of Φ for flow-through, calorimeter experimental systems. .24 7.4 Derivation of for closed chamber systems 24 7.5 Derivation of @ in room fire tests. .25 8 Calculation of combustion efficiency .25 8.1 General 25 8.2 Heat release efficiency 26 8.3 Oxygen consumption efficiency 26 8.3.1 General .26 8.3.2 Oxygen depletion method. .26 8.3.3 Oxygen-in-products method .27 8.4 Oxides of carbon method. .28 opyrntnteatonal rights reserved iii nitted without license from IHS Not for Resale, 07/10/2018 07:04:52 MDT